I understand that completely...I do a lot of things you would think I could....but the wrong move with my shoulders and I'm on the ground screaming.....when I was wrenching with my hands above my head every day....pure misery...It's hard to understand that I can throw a bag of feed over my shoulders and all is fine. Lift the toilet seat, pull back the covers, bend over to tie my shoes, and there goes the back. I am just at a dull ache now so I do intend to go back to running - or perhaps I should say jogging. I really love doing it.